A review of processes for separation and utilization of fluorine from phosphoric acid and phosphate fertilizers

Joshi, Amol N.

doi:10.1007/s11696-022-02323-9

Cited by 10 publications

(3 citation statements)

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“…Industrial chemistry has made remarkable advancements, leading to the development of various compounds with versatile applications. Among these, anhydrous hydrogen fluoride (AHF), in particular, has attracted significant attention owing to its expanding utility across diverse industrial sectors ( Joshi, 2022 ; Patel et al, 2023 ). As a compound consisting of hydrogen and fluorine, AHF is the building block for a wide array of chemical processes and products, serving as an indispensable catalyst and reactant.…”

Section: Introductionmentioning

confidence: 99%

“…The phosphate fertilizer industry is crucial for modern agriculture as it provides the essential nutrients required to enhance crop growth and food production ( Joshi, 2022 ). However, the process of extracting phosphorus from phosphate rock generates several byproducts, including fluorosilicic acid (H 2 SiF 6 ) ( Dahlke et al, 2016 ).…”

Section: Introductionmentioning

confidence: 99%

“…However, the process of extracting phosphorus from phosphate rock generates several byproducts, including fluorosilicic acid (H 2 SiF 6 ) ( Dahlke et al, 2016 ). This acid results from the reaction of fluoride-containing minerals with sulfuric acid, which is used to liberate phosphoric acid from raw phosphate ore ( Joshi, 2022 ). The multifaceted environmental hazards of fluorosilicic acid include its pronounced toxicity to aquatic life.…”

Section: Introductionmentioning

confidence: 99%

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Production of anhydrous hydrogen fluoride from fluorosilicic acid: a review

Yang,

Li,

et al. 2024

Front. Chem.

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Anhydrous hydrogen fluoride (AHF), a critical raw material for industries such as aluminum, pharmaceuticals, and petroleum, has traditionally been sourced from fluorite—a non-renewable mineral. The unsustainable reliance on fluorite has catalyzed the search for alternative AHF production methods. A promising substitute is fluorosilicic acid (FSA), a byproduct of the phosphate fertilizer industry previously deemed waste. Transforming fluorosilicic acid into AHF not only yields a valuable resource but also addresses the environmental and economic challenges associated with waste management. The innovative practice of producing AHF from fluorosilicic acid signals a shift towards sustainable chemical production by capitalizing on waste, potentially diminishing reliance on fluorite and reducing the industry’s environmental impact. This review thoroughly dissects the AHF synthesis process from fluorosilicic acid. Despite the acknowledged importance of fluorinated compounds in numerous industrial applications, research on their synthesis from fluorosilicic acid is limited and fragmented. This review seeks to amalgamate this scattered information by closely scrutinizing diverse industrial processing methods. Additionally, it explores the current and future landscape, economic feasibility, and strategies to navigate the obstacles inherent in synthesizing AHF from fluorosilicic acid. It also assesses the environmental impact of these methods, thereby contributing to the dialogue in this emerging field. The primary aim of this manuscript is to foster further research and promote the industrial uptake of this sustainable process. Highlighting the challenges and proposing potential improvements, the review supports the responsible reuse of waste and advocates for advancements in industrial practices.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%